It has been a couple of weeks since the last update. I took the plunge and started on the interior, including the dash.
I removed the stock dash, stripped it down (air bag panel, instrument cluster moulding, vents from the underside, etc.). Then inserted some MDF into the gaps, filled with fibre glass and body filler. I use some cable conduit for a round lip. It will all be covered with blue/white stitched faux leather once fitted.